Acting rapidly and violently; efficacious; powerful; opposed to bland; as, drastic purgatives
If you have to take drastic action in order to solve a problem, you have to do something extreme and basic to solve it. Drastic measures are needed to clean up the profession He's not going to do anything drastic about economic policy. = radical
A drastic change is a very great change. a drastic reduction in the numbers of people dying. + drastically dras·ti·cal·ly As a result, services have been drastically reduced. extreme and sudden drastic action/measures (drastikos, from dran )